Thanks for the info Knil92, I had thought of this, but writing directly to Sims without their consent / licence will potentially cause them to refuse support requests.
That said, the table is sims.udf_value, and looks to be straight forward other than the time_stamp column.
Does anyone know how to create the type of timestamp used in this table? It doesn't appear to be the normal type, as when I use the following SQL statement it creates a much longer timestamp, and all the values in this column are no longer than 7 hexadecimal characters.
SELECT CONVERT(timestamp, GETDATE())
Gives...
0x0000A997012C37A2
But there are no values higher than 0x000000000F27A8D5.